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          NSPredicate用法
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        <h1 id="序言"><a href="#序言" class="headerlink" title="序言"></a>序言</h1><p>谓词 NSPredicate 的基本用法。</p>
<h2 id="示例"><a href="#示例" class="headerlink" title="示例"></a>示例</h2><blockquote>
<p>比较运算符(&gt; , &lt; , &gt;&#x3D; , &lt;&#x3D;)</p>
</blockquote>
<figure class="highlight objc"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// NSPredicate *predicate = [NSPredicate predicateWithFormat:@&quot;self.age == 1&quot;];</span></span><br><span class="line"><span class="comment">// NSPredicate *predicate = [NSPredicate predicateWithFormat:@&quot;self.age &gt;= 11&quot;];</span></span><br><span class="line"><span class="built_in">NSPredicate</span> *predicate = [<span class="built_in">NSPredicate</span> predicateWithFormat:<span class="string">@&quot;self.age &lt; 5&quot;</span>];</span><br><span class="line"><span class="built_in">NSArray</span> *filterArray = [arrays filteredArrayUsingPredicate:predicate];</span><br></pre></td></tr></table></figure>

<blockquote>
<p>逻辑运算符(and[&amp;&amp;] , or[||] , not[!])</p>
</blockquote>
<figure class="highlight objc"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//NSPredicate *predicate = [NSPredicate predicateWithFormat:@&quot;(self.age &lt; 5) or (self.age &gt; 8)&quot;];</span></span><br><span class="line"><span class="built_in">NSPredicate</span> *predicate = [<span class="built_in">NSPredicate</span> predicateWithFormat:<span class="string">@&quot;not (self.age == 5)&quot;</span>];</span><br><span class="line"><span class="built_in">NSArray</span> *filterArray = [arrays filteredArrayUsingPredicate:predicate];</span><br></pre></td></tr></table></figure>

<blockquote>
<p>范围运算符(in , between)</p>
</blockquote>
<figure class="highlight objc"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// NSPredicate *predicate = [NSPredicate predicateWithFormat:@&quot;self.age between &#123;2,5&#125;&quot;];</span></span><br><span class="line"><span class="built_in">NSPredicate</span> *predicate = [<span class="built_in">NSPredicate</span> predicateWithFormat:<span class="string">@&quot;self.age in &#123;2,3&#125;&quot;</span>];</span><br><span class="line"><span class="built_in">NSArray</span> *filterArray = [arrays filteredArrayUsingPredicate:predicate];</span><br></pre></td></tr></table></figure>

<blockquote>
<p>包含字符串(beginswith , endswith , contains)</p>
</blockquote>
<figure class="highlight objc"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//NSPredicate *predicate = [NSPredicate predicateWithFormat:@&quot;self.name beginswith[c] &#x27;vch&#x27;&quot;];</span></span><br><span class="line"><span class="comment">//NSPredicate *predicate = [NSPredicate predicateWithFormat:@&quot;self.name endswith[d] &#x27;chan&#x27;&quot;];</span></span><br><span class="line"><span class="built_in">NSPredicate</span> *predicate = [<span class="built_in">NSPredicate</span> predicateWithFormat:<span class="string">@&quot;self.name contains &#x27;an&#x27;&quot;</span>];</span><br><span class="line"><span class="built_in">NSArray</span> *filterArray = [arrays filteredArrayUsingPredicate:predicate];</span><br></pre></td></tr></table></figure>

<p>[c] 不区分大小写，[d] 不区分发音符号，[cd] 不区分大小写和发音符号  </p>
<span id="more"></span>

<blockquote>
<p>通配符(like)</p>
</blockquote>
<figure class="highlight objc"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//NSPredicate *predicate = [NSPredicate predicateWithFormat:@&quot;self.name like[c] &#x27;*v*&#x27;&quot;];</span></span><br><span class="line"><span class="built_in">NSPredicate</span> *predicate = [<span class="built_in">NSPredicate</span> predicateWithFormat:<span class="string">@&quot;self.name like[cd] &#x27;??v*&#x27;&quot;</span>];</span><br><span class="line"><span class="built_in">NSArray</span> *filterArray = [arrays filteredArrayUsingPredicate:predicate];</span><br></pre></td></tr></table></figure>
<p><strong>* 表示匹配0个或者任意个字符 。 一个 ? 匹配任意一个字符</strong><br>上面的两个正则分别表示：<br>1、包含 <code>v</code> 即可<br>2、第三个字符必须是<code>v</code></p>
<blockquote>
<p>正则表达式(matches)</p>
</blockquote>
<figure class="highlight objc"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 匹配以字母开头的 name</span></span><br><span class="line"><span class="built_in">NSString</span> *regex = <span class="string">@&quot;[A-Za-z]+&quot;</span>;    </span><br><span class="line"><span class="built_in">NSPredicate</span> *predicate = [<span class="built_in">NSPredicate</span> predicateWithFormat:<span class="string">@&quot;self.name MATCHES %@&quot;</span>, regex];    </span><br><span class="line"><span class="built_in">NSArray</span> *filterArray = [arrays filteredArrayUsingPredicate:predicate];</span><br></pre></td></tr></table></figure>

<blockquote>
<p>占位符参数</p>
</blockquote>
<p><code>%K</code> 属性名<br><code>%@</code> 属性值</p>
<figure class="highlight objc"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">NSPredicate</span> *predicate = [<span class="built_in">NSPredicate</span> predicateWithFormat:<span class="string">@&quot;%K &lt; %@&quot;</span>, <span class="string">@&quot;age&quot;</span>, <span class="string">@&quot;5&quot;</span>];</span><br><span class="line"><span class="built_in">NSArray</span> *filterArray = [arrays filteredArrayUsingPredicate:predicate];</span><br></pre></td></tr></table></figure>

<h3 id="疑问"><a href="#疑问" class="headerlink" title="疑问"></a>疑问</h3><p>1、如何找到两个数组中ID相同的对象？</p>
<h2 id="文档"><a href="#文档" class="headerlink" title="文档"></a>文档</h2><p>还有很多相关的内容可查看官方文档。<a target="_blank" rel="noopener" href="https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/Predicates/AdditionalChapters/Introduction.html#//apple_ref/doc/uid/TP40001789">Predicate Programming Guide</a></p>

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